<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
    <form action="/calc">
        <div style="margin-top: 100px;text-align: center">
            <h1>计算器</h1>
            数字1 :<input name="num1"><br>
            数字2 :<input name="num2"><br>
            <input value="提 交" type="submit">
        </div>
    </form>

</body>
</html>